Vertex Pharmaceuticals Inc (US) Posted October 22, 2026

Toxicology Senior Research Fellow

San Diego, United States Full time
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Vertex Pharmaceuticals Inc (US) is the source of truth for this posting and owns the application process. We surface normalized context and market comparison you won't find on the original listing.

About this opportunity

Job Description

General Summary:

The Toxicology Senior Research Fellow acts as the Preclinical Safety Assessment (PSA) lead on Research project teams, cross-site teams and steering committees and is accountable for overall project and often disease area and/or site strategy supporting safety assessment of novel molecules and therapies advancing through the Vertex discovery pipeline into early development. The key scientific individual contributor functions as part of cross-functional project teams and designs appropriate safety in vivo and in vitro safety studies to support advancement of project compounds/therapies to the candidate nomination stage. The incumbent is also accountable for site safety strategy and plays an integrated role in research site scientific leadership.

This is a San Diego based, hybrid position requiring 3 days/week onsite.

Key Duties and Responsibilities:

Develops a broad and deep understanding of the disease area, target biology and chemical space for all Research programs at our San Diego site. Applies insight and knowledge to influence research strategy and target selection.

Independently develops the strategy for early safety assessment and support for multiple programs from target selection into development and aligns with PSA leadership

Collaborates with cross-functional and cross-site partners to develop safety strategies tailored to the portfolio at their resident site.

Acts as a liaison between the project teams and other PSA subfunctions to arrange required studies and profiling assays and communicates results to the project team and site management with appropriate interpretation.

Works with PSA study monitors to provide scientific oversight of external studies at CROs/partner organizations and communicates significant findings and study events to supervisors and PSA leadership in a timely manner.

Collaborates closely with the program regulatory toxicologists to ensure a smooth transition from research into development

Prepares high quality reports and presentations to clearly communicate study plans and results to peers, management and project teams

Keeps up to date with current literature and emerging industry trends in general pharmaceutical toxicology and therapeutics. Participates in relevant continuing education activities and drives own professional development.

Acts as an opinion leader and mentor to other toxicologists and cross-disciplinary research scientists.

Knowledge and Skills:

Subject matter expertise in small molecule toxicology and the design and interpretation of in vivo studies in common preclinical species

In-depth knowledge of animal husbandry and animal welfare issues

Excellent data processing and statistical skills

Excellent written, verbal communications and influencing skills

Microsoft Office Suite or equivalent office productivity tools

DABT certification preferred

Education and Experience:

Bachelor’s, Master’s or Doctoral degree in life sciences or chemistry

Typically requires a Bachelors degree and 20 years experience or

Typically requires a Masters degree and 15 years experience or

Typically requires a PhD and 11 years experience

#LI-KM1

#LI-Hybrid

At Vertex, we embrace continuous learning and encourage employees to stay informed on advances in AI, technology, automation, and industry trends. We seek talent who bring an external perspective, demonstrate curiosity and sound judgment, and thoughtfully adopt new capabilities that improve decision-making, drive innovation, increase efficiency, and help deliver better outcomes for patients.

Pay Range:

$232,000 - $348,000

Disclosure Statement:

The range provided is based on what we believe is a reasonable estimate for the base salary pay range for this job at the time of posting. This role is eligible for an annual bonus and annual equity awards. Some roles may also be eligible for overtime pay, in accordance with federal and state requirements. Actual base salary pay will be based on a number of factors, including skills, competencies, experience, and other job-related factors permitted by law.

At Vertex, our Total Rewards offerings also include inclusive market-leading benefits to meet our employees wherever they are in their career, financial, family and wellbeing journey while providing flexibility and resources to support their growth and aspirations.  From medical, dental and vision benefits to generous paid time off (including a week-long company shutdown in the Summer and the Winter), educational assistance programs including student loan repayment, a generous commuting subsidy, matching charitable donations, 401(k) and so much more.

Flex Designation:

Hybrid-Eligible Or On-Site Eligible

Flex Eligibility Status:

In this Hybrid-Eligible role, you can choose to be designated as:

1.    Hybrid: work remotely up to two days per week; or select

2.    On-Site: work five days per week on-site with ad hoc flexibility.

Note: The Flex status for this position is subject to Vertex’s Policy on Flex @ Vertex Program and may be changed at any time.

#LI-Hybrid

Company Information

Vertex is a global biotechnology company that invests in scientific innovation.

Vertex is committed to equal employment opportunity and non-discrimination for all employees and qualified applicants without regard to a person's race, color, sex, gender identity or expression, age, religion, national origin, ancestry, ethnicity, disability, veteran status, genetic information, sexual orientation, marital status, or any characteristic protected under applicable law. Vertex is an E-Verify Employer in the United States. Vertex will make reasonable accommodations for qualified individuals with known disabilities, in accordance with applicable law.

Any applicant requiring an accommodation in connection with the hiring process and/or to perform the essential functions of the position for which the applicant has applied should make a request to the recruiter or hiring manager, or contact Talent Acquisition at ApplicationAssistance@vrtx.com

Job details

Seniority
Senior
Function
Drug Discovery & Preclinical Research
Therapeutic area
Not listed
Location
San Diego, United States
Employment type
Full time

How this role compares

Computed from every other active Drug Discovery & Preclinical Research role in our database, not just this employer's listings.

We currently track 390 comparable Senior Drug Discovery & Preclinical Research roles across 55 biopharma companies.

390Comparable roles tracked
364Currently active
55Companies hiring similar roles
21Countries represented

Salary context

176 of 390 peers report a salary range (USD, annualized)

Peers share this role's job function and a matching or adjacent seniority level -- not necessarily the same therapeutic area or country.

This roleSubject $232,000/yr – $348,000/yr
Lowest disclosed · Senior Primate Behavior Specialist · Labcorp $70,000/yr – $80,000/yr
Highest disclosed · Associate Director, Portfolio Pathology · Novartis $185,500/yr – $344,500/yr
Peer group range $75,000 – $265,000 (median $159,125)

Where these roles are based

Top locations among the 390 comparable roles

United States298
China14
India13
United Kingdom10
Switzerland8
Germany7

+ 15 more countries

Seniority mix

390 of 390 peers have a known seniority level

Senior213
Principal146
Associate Director31

Therapeutic area mix

37 of 390 peers have a known therapeutic area; the rest are genuinely unlabeled, not hidden

Oncology15
Immunology10
Neuroscience8
Cardiovascular / CVRM3
Vaccines & Infectious Disease1

Similar opportunities

The closest matches from our peer group, ranked by how similar they are, not how well you'd qualify for them -- treat this as market context, not a guaranteed shortlist; a weak match is labeled as one below.

60%similar
Pharmacia & Upjohn Company Groton, United States Senior
Same function Same seniority Same country
60%similar
Pharmacia & Upjohn Company Groton, United States Senior
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60%similar
AbbVie North Chicago, IL Senior
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Gilead Sciences, Inc. Foster City, United States Senior
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60%similar
Gilead Sciences, Inc. Foster City, United States Senior
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60%similar
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Notify me about similar jobs

Get an email when we spot other openings like this one – same job function, comparable seniority, roles you'd actually want to see.

Or follow a whole field: get every new Drug Discovery & Preclinical Research job in the United States, and choose locations and companies.

How we calculate "similar"

No black box, no LLM guesswork: a deterministic score built from four normalized attributes. Here's this role's own peer group at different match levels, so you can see the mechanism, not just the result.

Every comparison starts from the same 100-point budget: 25 for working in the same function, 40 for the same therapeutic area, 20 for the same or adjacent seniority, 15 for the same country. A dimension we can't confirm on both sides contributes nothing, never a guess, never a free pass.

60%
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Function Therapeutic area Seniority Country
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Regeneron Pharmaceuticals, Inc (USA) · Tarrytown, United States · Senior
Function Therapeutic area Seniority Country
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Senior Toxicologist
Regeneron Pharmaceuticals, Inc (USA) · Cambridge, United States · Senior
Function Therapeutic area Seniority Country
Unmatched or unknown dimensions score exactly the same: 0 points, never a partial guess. A role we know almost nothing about beyond its function bottoms out at 25%; it never inflates to 100% just because there's little to compare against. Seniority uses a defined ladder (Associate → Manager → Associate Director → Senior → Principal → Director → Senior Director → Executive/VP) so "Director" and "Senior Director" count as adjacent, but "Director" and "Executive/VP" do not.